Abstract
The presence of web openings in castellated beams introduces different modes of failure at the perforated sections such as excessive stresses in tee-sections, excessive stresses in mid-depth of the web post, web-post buckling, developing plastic Vierendeel mechanism. This paper presents nonlinear behavior of castellated beams under moment gradient loading and investigates the effect of beam length and braced length on moment-rotation behavior and ductility of this type of beams. Accuracy of finite element models of plain-webbed beams is evaluated comparing moment-rotation behavior and failure mode of other researchers’ numerical models and cleared a satisfactory accuracy. Rotational capacity of castellated beams, derived from numerical modeling, is compared with corresponding I-shaped plain-webbed steel beams and it is cleared that for the short beams, web openings reduce energy absorbance and plastic moment capacity of the beams more than long ones.
Highlights
Using castellated I-shaped steel beams as main girders in moment resisting frames necessitates to observe some seismic code provisions, which is together with some erection difficulties
This paper presents nonlinear behavior of castellated beams under moment gradient loading and investigates the effect of beam length and braced length on moment-rotation behavior and ductility of this type of beams
Moment-rotation behavior of castellated steel beams were compared with corresponding plain-webbed beams in this research
Summary
Using castellated I-shaped steel beams as main girders in moment resisting frames necessitates to observe some seismic code provisions, which is together with some erection difficulties. Based on the results of 27 parametric models, a relationship between web posts horizontal shear capacity, which is depend on post geometry and its mechanical properties, and applied vertical load is determined and a procedure proposed to check the web post buckling failure mode of the supported beams subjected to uniformly distributed loads. Redwood [3] have investigated the web post buckling failure mode on 12 supported castellated beams loaded at mid-span of the beam. A. Mohebkhah [4] has studied the inelastic lateral torsional buckling of castellated beams subjected to concentrated and uniformly distributed loads using finite element method. In this paper a parametric study is done to investigate the moment-rotation behavior and ductility of castellated beams under moment gradient loading for different beam lengths using experiments data and finite element modeling
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